1,1-diphenyl-2-methyl-3-alkylideneamino-1-propanols



United States Patent 3,481,981 1,1-DIPHENYL-2-METHYL-3-ALKYLIDENEAMINO. l-PROPANOLS Robert B. Moflfett, Kalamazoo, Mich, assignor to The Upjohn Company, Kalamazoo, Mich., a corporation of Delaware No Drawing. Continuation-impart of application Ser. N0. 392,301, Aug. 26, 1964. This application Nov. 23, 1966, Ser. No. 596,419

Int. Cl. (307:: 119/06, 91/16; A61k 27/00 US. Cl. 260-566 2 Claims ABSTRACT OF THE DISCLOSURE A compound of the formula:

wherein R is hydrogen or lower-alkyl containing from one to five carbon atoms, R is lower-alkyl containing from one to five carbon atoms, X, X, X, Y, Y, and Y" are hydrogen, loWer-alkyl containing from one to four carbon atoms, lower alkoxy containing from one to four carbon atoms or halogen having CNS stimulating and anorexigenic activity and having a longer duration of action and fewer side effects than the corresponding primary amine.

This application is a continuation-in-part of copending application Ser. No. 392,301 filed Aug. 26, 1964.

This invention relates to new and useful compounds and more particularly the invention relates to compounds having the formula:

WE X X c-on-cm-n o I (Formula I) wherein R is hydrogen or lower-alkyl containing from one to five carbon atoms, inclusive, R is loWer-alkyl containing from one to five carbon atoms, inclusive, X, X, X", Y, Y, and Y" are hydrogen, lower-alkyl containing from one to four carbon atoms, inclusive, loweralkoxy containing from one to four carbon atoms, inclusive, or halogen.

Examples of lower-alkyl are methyl, ethyl, propyl, butyl, and pentyl, including isomeric forms thereof. Examples of lower-alkoxy are methoxy, ethoxy, propoxy, and butoxy, including isomeric forms thereof. The term halogen is inclusive of fluorine, chlorine, bromine, and iodine.

3,481,981 Patented Dec. 2, 1969 The compounds of Formula I can be prepared by reacting a 1,1-diphenyl-2-methyl-3-aminopropanol of Formula II with an aldehyde or ketone of Formula III, in accordance with the equation:

X X OH R C-(EH-CH -NH O=C\ Y I Y7 I H2O (Formula II) (Formula III) wherein X, X, X", Y, Y, Y, R, and R are as given above.

The Formula II primary amine (unsubstituted or having benzene ring substitution) is reacted with the Formula III aldehyde or ketone in accordance with procedures known in the art for the preparation of Schifi bases. Illustratively, the reaction is carried out in the presence of a water-immiscible, inert solvent such as benzene, toluene, xylene, and the like, at the boiling point of the reaction mixture and azeotropically removing the water formed during the reaction. The reactants can be employed in substantially equimolar amounts or an excess of either reactant can be employed if so desired. Upon completion of the reaction, the compound of Formula I can be isolated and purified by conventional methods, for example, by evaporating the mixture to dryness and crystallizing the residue from a solvent such as methanol, ethanol, l-propanol, 2-propanol, acetone, ethyl acetate and the like, or by chromatography, fractional crystallization, or combinations of such methods.

Alternatively, in many instances the desired reaction can be effected merely by mixing the Formula II primary amine with a substantial excess of the Formula III compound at temperatures ranging between about 50 C.

and about C. This procedure is particularly applicable and convenient when a ketone reactant is employed, such as acetone, methyl ethyl ketone, or diethyl ketone. The resulting Formula I Schiff base can be obtained in conventional manner, e.g., by concentrating the solution, cooling, and filtering.

The 1,1-diphenyl-2-methyl-3-aminopropanols (Formula II above) can be prepared as disclosed in Spanish Patent No. 316,517 issued Jan. 27, 1966 and Belgian Patent No. 668,835 issued Feb. 28, 1966.

The compounds of the Formula I are useful in preparing the corresponding secondary amines by catalytic hydrogenation or by reduction with sodium borohydride. The secondary amines, so prepared, can then be used as disclosed in the above cited Spanish and Belgian patents.

The compounds of the Formula I have pharmacological activities similar to those exhibited by the corresponding Formula 11 primary amines from Which they are derived and can be used for the same purposes, e.g., the compounds of the Formula I elicit central nervous system (CNS) stimulatory and anorexigenic effects. The compounds of the Formula I differ from the corresponding primary amines in that they are longer acting and have 3 fewer side etfects. For example, 1,1-diphenyl-2-methyl-3- (isopropylidineamino)propanol is less toxic, shows less gross stimulation and is more active as an anorexigenic than 1,1-diphenyl-2-methyl 3 aminopropanol hydrochloride.

EXAMPLE 1 1,1-diphenyl-2-methyl-3- (isopropylidineamino)propanol 12.1 grams (0.05 mole) of 1,1-diphenyl-2-methyl-3- amino-propanol was dissolved in 75 ml. of acetone near the boiling point. The solution was filtered and concentrated (by boiling) to 50 ml., giving on cooling, 11.1 grams (79% theory) 1,1-diphenyl-2-methy1-3-(isopropylidineamino)propanol as white crystals having a melting point of 135.5-137.5 C.

AnaIysis.-Calcd. for C H NO: C, 81.10; H, 8.24; N, 4.98. Found: C, 80.79; H, 8.23; N, 5.04.

EXAMPLE 2 Following the procedure of the preceding Example 1 but substituting an equimolar amount of:

1,1-bis(2-bromophenyl)-2-methyl-3-aminopropanol,

1,1-bis(3-bromophenyl)-2-methyl-3-aminopropano1,

l-phenyl-1-(2-chl0rophenyl)-2-methyl-3-aminopropanol,

1,1-bis(4-ch1orophenyl)-2-methyl-3-aminopropanol,

1,1-bis(2-iodophenyl)-2-methyl-3-aminopropanol,

l-phenyll- (4-fiuorophenyl -2-methyl-3 -aminopropanl,

l-phenyl-1-(3-iodophenyl)-2-methyl-3-aminopropanol,

l-phenyl-1-(2-methylphenyl) -2-methy1-3-amin0propanol,

1-phenyl-1-( 3-bromo-4-methylphenyl) -2-methyl-3- aminopropanol,

1- 2-bromophenyl -1- (4-methylphenyl) -2-methyl-3 amino propanol,

1- (4-bromophenyl -1- (4-ethoxyphenyl) -2-methyl-3- aminopropanol,

1- (2-methoxy-5-methylphenyl) -1- 2-bromophenyl) -2- methyl-3-aminopropanol,

l-phenyl-1-(4-propylphenyl)-2-methyl-3-aminopropanol,

l-phenyll- (2-,4,5-trimethylphenyl -2-methyl-3-aminopropanol,

1, l-bis (4-methoxyphenyl) -2-methyl-3 -aminopropanol,

l-phenyl-1-(4-propoxyphenyl) -2-methyl-3-aminopropanol,

l-phenyl-l (2,4,5-trimethoxyphenyl -2-methyl-3- aminopropanol,

1,1-bis(2,4-dimethoxyphenyl)-2-methy1-3 -aminopropanol,

1,1-bis (3,4-dimethoxyphenyl )-2-methyl-3-aminopropanol,

1, l-bis (2,4,5 -trimethoxyphenyl) -2-methyl-3 -aminopropanol,

1- 2,4,6-trimethoxyphenyl -1- 3,4,5 -trimethoxyphenyl 2-methyl-3-aminoprop anol,

l-phenyl- 1 3-fiuorophenyl) -2-methyl-3 -aminopropano1,

1,1-bis(4-fluorophenyl)-2-methyl-3-aminopropanol, and

1, l-bis 3-fiuorophenyl) -2-methyl-3-aminopropanol for the 1,1-diphenyl-2-methyl-3-aminopropanol of the example there can be respectively obtained:

1,1-bis(2-bromopheinyl) -2-methyl-3-(isopropylideneamino) propanol,

1,1-bis(3-bromophenyl) -2-methyl-3- (isopropylideneamino)propanol,

l-phenyl- 1- (Lchlorophenyl) -2-methyl-3- (isopropylideneamino) propanol,

1,1-bis(4-chlorophenyl)-2-methyl-3-(isopropylideneamino propanol,

1 1-bis(2-iodopheny1) -2-methy1-3- (isopropylideneamino) propanol,

I-phenyl-l- (4-fiuorophenyl -2-methyl-3- (isopropylideneamino propanol,

l-phenyl-1-(3-iodophenyl) -2-methyl-3 (isopropylideneamino pro panol,

l-phenyl-l- (Z-methylphenyl -2-methyl-3 -(isopropy1- ideneanimo) propanol,

l-phenyl-1-(3-bromo-4-methylphenyl)-2-methyl-3-(isopropylideneamino propanol,

1-(2-bromopheuyl)-1-(4-methylphenyl) -2-methyl-3- (isopropylideneamino propanol,

1- (4-bromophenyl -1- (4-ethoxyphenyl) -2-methyl-3- (isopropylideneamino propanol,

1- (Z-methoxy-S-methylphenyl) -1- (2-.bromophenyl) -2- methyl-3- (isopropylideneamino propanol,

l-phenyl-l- (4-propylphenyl) -2-methyl-3- (isopropylideneamino) propanol,

l-phenyl- 1- (2,4,5 -trimethylphenyl) -2-methyl-3-(isopropylideneamino propanol,

1,1-bis (4-methoxyphenyl)-2-methyl-3-(isopropylideueamino propanol,

l-phenyl-1-(4-propoxyphenyl) -2-methyl-3- (isopropylideneamino propanol,

l-phenyl- 1 (2,4,5 -trimethoxyphenyl) -2-methyl-3- (isopropylideneamino prop anol,

1, l-bis (2-,4-dimethoxyphenyl) -2-methyl-3 (isopropylideneamino propanol,

l,1-bis(3,4-dimethoxyphenyl) -2-methy1-3-(isopropylideneamino propanol,

1, l-bis (2,4,5-trimethoxyphenyl) -2-rnethyl-3- (isopropylideneamino prop anol,

1- 2,4, 6-trimethoxyphenyl -1-(3 ,4,5-trirnethoxyphenyl 2-methyl-3- (isopropylideneamino) propanol,

1-phenyl-1-(3 -fluorophenyl -2-methyl-3- (isopropylideneamino propanol,

1,1-bis(4-fiuorophenyl)-2-methyl-3-(isopropylideneamino) propanol, and

1,1-bis(3-fluorophenyl) -2-methyl-3- (isopropylideneamino) propanol.

EXAMPLE 3 A benzene solution containing approximately equimolar aomunts of 1,1-dipheny1-2-methyl-3aminopropanol and acetaldehyde can be refluxed (using a Dean-Stark trap), and after removal of approximately the theoretical amount of water, the solution can be evaporated to dryness under reduced pressure to obtain 1,1-diphenyl-2- methyl-3-(ethylideneamino)propanol.

Following the above procedure, substituting for acetaldehyde an equimolar amount each of: propionaldehyde, butyraldehyde, isobutyraldehyde, valeraldehyde, 2-methylbutyraldehyde, caproaldehyde, diethyl ketone, diptopyl ketone, diisopropyl ketone, dibutyl ketone, diphentyl ketone, methyl ethyl ketone, methyl see.butyl ketone, methyl neopentyl ketone, and methyl isopropyl ketone there can be respectively obtained:

1, l-diphenyl-2-methyl-3 (propylideneamino )propanol,

1,1 dipheny1-2-methyl-3-(butylideneamino)propanol,

1,1-diphenyl-2-methyl-3-(isobutylideneamino)propanol,

1,1-diphenyl-2-methyl-3-(pentylideneamino)propanol,

1,1-diphenyl-2-methyl-3-(2-mehtylbutylideneamino) propanol,

1, 1-diphenyl-2-methyl-3 (hexylideneamino propanol,

1, 1-dipheny1-2-methy1-3-( 1ethylpropy1ideneamino) propanol,

1,1-dipheny1-2-methyl-3-( l-propylbutylideneamino) propanol,

1,1-diphenyl-2-methyl-3- 1-isopropy1-2-methylpropylideneamino) propanol,

1, 1-dipheny1-2-methy1-3-( l-butylpentylidenearnino) propanol,

1,1-diphenyl-2-methy1-3-( l-pentylhexylideneamino) propanol,

1, 1-diphenyl-2-methy1-3- (sec.buty1ideneamino) propanol,

(1,Z-dimethylbutylideneamino)propanol,

1, 1-diphenyl-2-methyl-3-( 1,3,3 -trimethylbutylideneamino propanol, and

1,1-diphenyl-2-methyl-3-(1,2-dimethylpropylideneamino) propanol.

5 6 What is claimed is: taining from 1 to 4 carbon atoms, inclusive, or halogen. 1. A compound of the formula 2. A compound according to claim 1 which is 1,1-diphenyl-2-methyl-3-(isopropylideneamino)-1-pr0panol.

k X E R v References Cited e- :11-o112 N=o UNITED STATES PATENTS on; R 2,422,013 6/1947 Haury m1 260-566 Q FOREIGN PATENTS Y Y 10 811,659 4/1959 Great Britain.

936,041 9/1963 G tB 't wherein R 1s hydrogen or lower alkyl containing from rea n am one to five carbon atoms, inclusive, R is loWer-alkyl con- ROBERT HINES Primary Examiner taining from one to five carbon atoms, inclusive, X, X,

X, Y, Y, and Y" are hydrogen, loWer-alkyl containing 15 U S C1 X R from 1 to 4 carbon atoms, inclusive, lower-alkoxy con- 260 570, 999 

